2011AJ....142...77D

Query : 2011AJ....142...77D

2011AJ....142...77D - Astron. J., 142, 77 (2011/September-0)

Four new T dwarfs identified in Pan-STARRS 1 commissioning data.

DEACON N.R., LIU M.C., MAGNIER E.A., BOWLER B.P., GOLDMAN B., REDSTONE J.A., BURGETT W.S., CHAMBERS K.C., FLEWELLING H., KAISER N., LUPTON R.H., MORGAN J.S., PRICE P.A., SWEENEY W.E., TONRY J.L., WAINSCOAT R.J. and WATERS C.

Abstract (from CDS):

A complete well-defined sample of ultracool dwarfs is one of the key science programs of the Pan-STARRS 1 optical survey telescope (PS1). Here we combine PS1 commissioning data with the Two Micron All Sky Survey (2MASS) to conduct a proper motion search (0".1-2".0/yr) for nearby T dwarfs, using optical+near-IR colors to select objects for spectroscopic follow-up. The addition of sensitive far-red optical imaging from PS1 enables discovery of nearby ultracool dwarfs that cannot be identified from 2MASS data alone. We have searched 3700 deg2 of PS1 y-band (0.95-1.03 µm) data to y ~ 19.5 mag (AB) and J ~ 16.5 mag (Vega) and discovered four previously unknown bright T dwarfs. Three of the objects (with spectral types T1.5, T2, and T3.5) have photometric distances within 25 pc and were missed by previous 2MASS searches due to more restrictive color selection criteria. The fourth object (spectral type T4.5) is more distant than 25 pc and is only a single-band detection in 2MASS. We also examine the potential for completing the census of nearby ultracool objects with the PS1 3π survey.

Abstract Copyright: ∼

Journal keyword(s): brown dwarfs - stars: low-mass - surveys

VizieR on-line data: <Available at CDS (J/AJ/142/77): table2.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J11555389+0559577 BD* 11 55 53.89032 +05 59 57.7032           L7.5 39 0
2 2MASS J12035812+0015500 BD* 12 03 58.1345813415 +00 15 50.101214352           L5.0V 47 1
3 2MASS J12060248+2813293 BD* 12 06 02.48952 +28 13 29.3160           T2.0+T4.5 21 0
4 2MASS J12501166+3925582 BD* 12 50 11.66856 +39 25 58.2060           T4.0 15 0
5 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 167 0
6 2MASS J13240776+1906271 BD* 13 24 07.76184 +19 06 27.1980           T3.5 11 0
7 2MASS J13452562+5216337 BD* 13 45 25.62 +52 16 33.8           L3 7 0
8 2MASS J13585269+3747137 BD* 13 58 52.69176 +37 47 13.7328           T4.5 16 0
9 2MASS J14023175+0148301 BD* 14 02 31.7693132880 +01 48 30.223543212           L1 12 0
10 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
11 2MASS J15050230-2853408 BD* 15 05 02.30904 -28 53 40.8084           T1.5 9 0
12 SDSS J151114.65+060742.9 BD* 15 11 14.66280 +06 07 43.1652           T2.0 40 0
13 2MASS J15450901+3555271 BD* 15 45 09.01392 +35 55 27.1128           L7.5 13 0
14 2MASS J15530228+1532369 BD* 15 53 02.28072 +15 32 36.9132           T6.5+T7.5 63 0
15 2MASS J16225533+1159238 BD* 16 22 55.33584 +11 59 23.8920           L4.5 10 0
16 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
17 2MASS J16254152+1528140 BD* 16 25 41.52984 +15 28 14.0340           T4.5 6 0
18 2MASS J16283855+2308241 BD* 16 28 38.55000 +23 08 24.1980           T7.0 24 0
19 2MASS J16291840+0335371 BD* 16 29 18.40896 +03 35 37.1040           T2 34 0
20 2MASS J21404654+0112594 BD* 21 40 46.54198 +01 12 59.4143           L4.4V 13 0

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